Body constructed of sheet-iron sections



Oct. 28, 1930. w. REICEHEL 1,779,950

BODY CONSTRUCTED OF SHEET IRON SECTIONS Filed June 25. 1928 Patented Oct. 28, 1930 UNITED STATES PATENT oFFicE WALTER EEICHEL, OF BERLIN-LANKWITZ,

GERMANY, ASSIGNOR TO SIEMENS-SCHUC- CORPORATION OF GERMANY BODY CONSTRUCTED OF SHEET-IRON SECTIONS Application filed. June 25, 1928, Serial No. 288,179, and in Germany June 29, 1927.

My invention relates to improvements in bodies constructed of sheet iron sections, such as are used in electric machines and apparatus. Hitherto it was customary to attach the iron segments, sections or punchings rigidly to a carrier member by one or a plurality of fastening or holding members or means. This design involves, particularly in the case of large size machines, a serious drawback in so far as the punchings have the natural tendency to expand under the action of heat, but are prevented from doing so by their fastening means.

According to my invention this disadvantage is avoided by arranging the segments or stampings in their fastening or holding means with tangential play. To prevent an arbitrary displacement of the laminations they are not provided with play at all fastening points, but are rigidly held at some of the attachment points. In a preferred construction the segments are rigidly mounted at about their middle and the ends have tangential play within their fastening means. To permit of convenient assembly of the lam inated body and to facilitate the expansion in the direction of the circumference the iron punchings may previously be assembled into packs or blocks and these may then be assembled in their shell with overlap, so that joints of one circumferential row or layer are overlapped by the segment packs of the adjoining layers. In electric machines this mode of attachment may be employed for stators as well as for rotors.

In the drawing aflixed hereto and forming part of my specification an embodiment of my invention is illustrated by way of exam- The drawing shows part of a stator of an electric machine in perspective view.

Referring to this figure it will be seen that on the inner periphery of the stator frame 79 are fixed in spaced relation transverse T- shaped keys indicated by t t 23 which engage corresponding T-slots provided in the segments, whereby the individual punched sheet iron segments are held in place. In the direction of the circumference the T-slots formed by adjacent punchings are slightly larger than the keys which they contain, as will be seen at and t but the central slots of the individual punchings fit their keys closely as shown at 15 so that at these points the segments are circumferentially immovably attached to the frame p. The segments are preferably combined into packs or blocks and these are so assembled that each pack in one annular layer overlaps the section joints of the adjacent layers as clearly appears in dotted lines in the drawing. The stampings constituting the individual packs are preferably held together by rivets as indicated at n or by other suitable means known in the art.

Various modifications and changes may be made without departing from the spirit and the scope of the invention, and I desire, therefore, that only such limitations shall be placed thereon as are imposed by the prior artl I claim as my invention:

1. In combination, a ring divided into a plurality of sections circumferentially spaced apart, a rigid carrier member common to all of said sections, and means for individually supporting said sections on said carrier member so as to permit their expansion in circumferential direction.

2. In combination, a ring divided into a plurality of sections circumferentially spaced apart, a carrier member for said sections, means for attaching each section to said carrier member rigidly at one section point, and means for movably attaching the remainder of each section to said carrier so as to permit the expansion of each section in circumferential direction.

3. In combination, a ring divided into a plurality of sections circumferentially spaced apart, a carrier member for said sections, means for rigidly attaching each section midway between its ends to said carrier member, and means for movably attaching the ends of each section to said carrier member, so as to permit the expansion of each section in circumferential direction.

4. In combination, a ring divided into a plurality of sections circumferentially spaced apart, a carrier member for said ring, axially directed T-shaped keys on said carrier member and correspondingly T-shaped slots in said sections for engaging said keys, to attach said sections to said carrier member, some of said slots being larger in circumferential ring direction than the key portions engaging them, to permit expansion of said segments in circumferential direction.

5. In combination, a ring divided into a plurality of sections circumferentially spaced apart, a carrier member for said ring, each section having a T-shaped transverse slot midway between its ends, and a correspondingly Tshaped key for each section fixed on said carrier for rigidly attaching'ea'ch section Q 7 midway between its ends to said carrier, T-

shaped transverse keys on said ring disposed adjacent to the section ends and correspondingly shaped T-slots at said section endsengaging said last named keys for attaching the section "ends to said carrier, said last named slots being slightly longer in circumferential ring direction than their engaging key portions to permit expansion of said segments in circumferential direction;

- 6. In a supporting arrangement for laminated armature cores, the combination of a ring core consisting of a plurality of adjacent annular layers, each layer being divided into a plurality of sections circumferentially spaced apart, and each section consisting-of a pack of sheet iron laminae, acarrier'member for said ring, each section having a T-shaped transverse slot midwaybetween its ends, and acorrespondinglyT-shaped key for each section fixed on said carrier for rigidly attaching each section midway between its ends to said carrier, T-shaped transverse keys on said ring disposed adjacent to the section ends and correspondingly shaped T-slot s at said section ends engaging said last named keys for attaching the section ends to said carrier, said last named slots beingslightly longer in circumferential ring direction than their engagn mg keyportions to permit expansion of said segments in circumferential direction, the adj acent annular layers of said ring being cir}v cumferentially positioned. relatively to each other so that the central portions of the sec? tions of one layer bridge the spaces between the adjoining sections of the adjacent annular layer. V In testimony whereof I aflix my signature.

. Y WALTER REIOHEL. 

